The August draft of the SQL:200n standard (9075-2 Foundation) says in Section 4.17.2: "Every table constraint specified for base table T is implicitly a constraint on every subtable of T, by virtue of the fact that every row in a subtable is considered to have a corresponding superrow in every one of its supertables."
Peter Gulutzan Co-Author, SQL-99 Complete, Really Co-Author, SQL Performance Tuning ---------------------------(end of broadcast)--------------------------- TIP 3: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
